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In the process of paralleling lithium batteries, the key lies in ensuring the consistency of battery parameters, including capacity, open circuit voltage and internal resistance. Only when these parameters are similar can the batteries be connected in parallel. And for safety reasons, a protection board needs to be installed. In the case of parallel connection of multiple batteries, if one of the batteries has a lower capacity while other parameters are the same, this will bring some potential problems.
During the charging process, if the paralleled batteries are not equipped with a protection board, a charger with a limited voltage of 4.2V must be used to prevent the lithium battery from overcharging and exploding. Even if a protection board is installed, since the battery with low capacity will be fully charged first, being in a state of overcharging for a long time will lead to an increase in the internal electrolyte and the occurrence of side reactions, and then cause battery leakage. During the discharging process, the battery with low capacity may also be over-discharged. This will not only reduce the battery life but also bring the risk of leakage. Therefore, batteries that are in a state of overcharging and over-discharging for a long time have great potential safety hazards and may even cause explosions or fires. Considering that your batteries are disassembled from power banks, the parameters may be inconsistent, and it is uncertain whether a protection board is installed. It is strongly recommended not to assemble and use them by yourself to avoid potential safety hazards.

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